FREE-PISTON INTERNAL COMBUSTION ENGINE Russian patent published in 1998 - IPC

FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: engine has torous housing 1 divided into section "intake-outlet" section, fuel injection section 3, compression section 4 and expansion section 5. Sections 4 and 5 are furnished with induction coils 6 and 7. Pistons 8,9,10,11 freely rotating inside housing are interchangeable. They consists of main piston and auxiliary piston moved along tubular axle one end of which opens into housing working channel. Holes are made in end face of other end of axle. Main housing is provided with sealing rings at outer side. Ferromagnetic insulated rings are placed between sealing rings. Induction coils 6 and 7 are wound from outer side of housing of sections 4 and 5. According to one design version, winding is done with insulated wire directly on housing. According to other version, intermediate jacket is placed between housing and induction coils inside which cooling liquid circulates. EFFECT: improved efficiency of vehicles with electric drive of propeller (propeller screw, electric motor in hubs, etc). 11 cl, 6 dwg